Definition

Paranasal sinus cancer is a disease in which cancer (malignant) cells are found in the tissues of the paranasal sinuses—the four hollow pockets of bone surrounding the nasal cavity.

Description

The paranasal sinuses, which are arranged symmetrically around the nasal cavity, include the:

• frontal sinuses (in the forehead, directly above the nose)
• ethmoidal sinuses (on each side of the nasal cavity, just behind the upper part of the nose)
• maxillary sinuses (on each side of the nasal cavity, in the upper region of the cheek bones)
• sphenoidal sinuses (behind the ethmoidal sinuses, in the center of the skull)

The paranasal sinuses, which...